Tool-holder.



v J K INVENTOR )(ENITNESSES: 20 Mu,

G. AMBORN.

TOOL HOLDER.

APPLICATION FILED JAN. 6, 1913.

1,158,100. Patented Oct. 26, 1915.

' Fig. J.

H/ A F H W By Azzorneyx,

devicewhich engages its inner face K.

uniran snares PATENT enrich.

GEORGE AMBORN, 0F CHAPINVILLE, CONNECTICUT, ASSIGNOR TO 8'. WILLIAMSGO., 0F BROOKLYN, NEW YORK, ACORPORATION 0F NEW YORK.

TooL-noLnEn T '0 (126 whom it may concern.

Be it known that I, GEORGE AMBORX, a citizen of the United States,residing at Chapinville, in the county of Litchfield and State ofConnecticut, have invented certain new and useful Improvements Fin Tool-.Holders, of'which the following is a specivation of the same; Fig.4 avertical longi;'

tudin'al section of the same before clamping Fig. 5 is,a detail of aslightly modified style of cam member for clamping the tool in place;and Fig. 6 is a section of the tool on the line 6-6 of Fig. 4.

1 Referring now to the embodiment of the invention illustrated, the toolAha-s a head B slightly enlarged in width, and the lower portion ofwhich projects beyond the upper portion so as to provide a projectingpor-' tion C with a fiat face D upon which the head of the tool mayrest. The projecting portion G of the holder is formed with a verticalbore E extending entirely through it so as to receive the stem F of thetool,-

while the head G of the latter rests upon the top of the extension C.The hole E is reamed out on its upper end to form the flare H, and theupper end of the stem of the tool is provided with a fillet J extend'-'ing'part way around as shown in Fig. 6.

The em J is cut away on its inner side face.

The tool has a vertical inner side face K which bears against a verticaltransverse face L the outer end of the upper part of the holder.

The tool, in the position illustrated, with its stem F extending intothe hole E of the holder, is clamped by means of a clamping Asillustrated, this clamping device comprises a short pin. 'M extendinglongitudinally through a suitable opening N in the upper part of theholder, the pin having a head Q Specification of Letters Patent.

.i'a'tented Get. 265, 1915.

Application filed January 6, 1913. Serial No. 740,317.-

fitting loosely in the enlarged portion P of the opening N, the head 0of the pin being engaged by a cam Q, which constitutes the intermediatepart of the cam member, the end portions R and S of which constitutebearings fitting with a good bearing fit in a vertical opening T of theholder. After in sorting the pin in place through the hole T and theninserting the cam member, the'lattcr is fastened by means of a wire ringU partly entering a groove in the. cammember, and a surrounding groovein the body of the holder. The pin is thus retained by the cam even whenthejsool is Withdrawn, and cannot drop out of the holder or be withdrawnexcept after first withdrawing the cam.

T e horizontal strain upon the tool is in the direction of the arrowshown in Fig.-1

and this strain is resisted by the bearing of the vertical face K of thetool against the corresponding face L of the holder. The inner verticalbearing face K of the tool is slightly cut away as indicated at. V so asto provide a face for engagement b q the end of the 'clamping pin M; theface 'V being slightly inclined and in such a direction as to tend torotate the tool about its stem F in the same direction in which the toolwould be rotated by the working strain. Without this slightly inclinedface V the clamping pin M would tend to press the center of theverticalbearing face K of the tool away from the corresponding face ofthe holder, so that the tool would rock slightly in a horizontal planeabout the end of the clamping pin. By providing the slightly inclinedface V the pressine of the clamping pin tends to swing the to wl about avertical so as to bring the rear f' or onof the faoeK of the tool tobear strongly against the cor:

responding portion oi the face 11 of the i holder; and the tool is thusheld with a rigid hearing at two points, the end of the pin M i and therear portion of the face L, and bears squarely on the end of the pin, asshown in F 1g. 1

The toolmust be easily set into the holder.

and withdrawn therefrom, and must therefore fit the holder loosely. Thisbeing the fact the pushing forward of the pin M against the face V ofthe tool will push the tool away i'rom the holder so as to separate thefaces It. and L and Wlll turn the tool on its vertical axis untilfurther turning is prevented by the bearing of the rear portion of theface K against the face L; the parts being so designed and proportionedthat this contact of the rear portions of the faces K and L will takeplace simultaneously with the'coming, of the pin M to flat bearingagainst the face V, as shown in Fig. 1, or slightly before such a flathearing at V.

The holder thus described will take either a right-handed or aleft-handed crtter, or straight. special, cutters of various sorts.

The 1am member may be operated by means of a projecting pol gonal head\V (Fig, 5), Preferably however the member is made hollow as shown inFig. l, and is provided with a hexagonal or other polygonal opening intowhich a suitably shaped clamping tool can be inserted to turn the camand grip the cutting tool. lhismpening X preferably extends through thecam member from end to end so that the tool by which this member isturned can secure a long bearing therein. lhe opening X is slightlyflared at thesends so that the tool wt. eh fits therein will come to abearing most firmly at points l5 etween the ends and between the endportions R and S which constitute the rotary bearings of the cam member.This avoids any eccentric strain upon these rotary bearings, and insuresthe greatest durability for the entire construction.

No claim is made herein on the design and mounting of the cam member,except in combination with other features, the design and mounting ofthe cam member being claimed in a separate application (Serial Xumber740,102, filed January -l, 1913).

I claim as my invention 1. A tool holder having a transverse open ingadapted to receive the shank of a tool and a. longitudinal opening withan enlarge ment at its rear end, a lougitudimilly movable pin in saidopening having an enlarged head. fitting loosely in said enlargement,said holder having a rear opening. communicating with said longitudinalopening and of sufficient size to permit the passage of saidpin into itsplace, and means in said rear opening serving to retain said. pin inplace and to force Said. pin against such a tool to clamp the latter inplace.

2. A tool holder having a pin adapted to be forced against a. tool toclamp the latter in place and having an. opening to receive said pin,said opening having an enlargement at its rear end and said pin havingan enlarged head fitting loosely in said enlarge ment, said holderhaving a second opening communicating with the rear end of thefirst-mentioned opening and large enough to permit the passage. of saidpin'into its place, and means in said second opening for retaining saidpin in its place.

3. A tool holder having-a pin adapted to ing adapted to receive theshank of a tool,

a longitudinal opening for receiving a clalllplllg pm and a verticalopening adapted to receive a cam rotatable about a vertlcal axis, saidvertical. opening communicatingwith said longitudinal opening and beingof suliicicnt size to permit the passage of such a clamping pin throughsaid vertical opening and into said longitudinal opening, a clamping pinadapted to enter said longitudinal opening and having an enlarged headto prevent its passage forward through said longitudinal opening, and acam adapted to enter said, vertical opening and bear against the head ofsaid pin to hold said pin in place and to force the same against thetool.

5. A tool holder having a projecting portion formed withashank-receiving vertical opening adapted to receive the shank of a.tool and with a' face adapted to support the head of such tool, saidholder having a longitudinal opening, a clamping pin in saidlongitudinal opening adapted to engage with its outer end a side face ofthe head of such tool when the shank of the tool is in said verticalopening-so as to clamp such tool in place, said clamping pin being heldagainst forward passage through its longitudinal opening when thetool'is removed, said holder having a cam-receiving transverse openingin the rear of said pin, and a rotatable cam in said canrreceivingtransverse opening bearing against the rear end of said pin and adaptedby its rotation to forcethe pin against the tool.

, 6. A tool holder having a projecting portion with a flat face uponwhich the head ofa tool may rest and with a vertical bore to receive astem of such tool, and having a vertical transverse face adjacent to thehead of such tool, said tool holder having a second vertical openingback from said transverse face and having a longitudinal openingextending from said transverse face to said second vertical opening,said second vertical opening being cylindrical, a cam journaled thereinto rotate about a vertichl axis and fixed against longitudinal movement,and a clamping pin in said longitw dinal opening hearing at its rear endagainst said cam and adapted to hear at its outer for preventing theorward passage of said pin through its opening when the tool is re--moved while permitting a sufficient advance of the pin to avoidinterference with the in-' sertion and Withdrawal of the cam into andout of its opening.

7. A tool holder having a vertical opening adapted to receive the shankof a tool and having a face which receives the backward pressure pf thetool in combination with a tool having a face adapted to bear againstsaid face of the holder and a movable member adapted to bear. against aportion of said face of the tool to' clamp the latter in place, theengaging portions of said face of the tool and of said movable memberbeing so shaped that the pressure of said member tends to turn the rearof the face of the tool hard against said face of the holder.

8. A toolholder having a vertical opening adapted to receive the shankof a tool, and having a face L which receives the backward pressure ofthe tool in combination with a tool havin a face K adapted to bearagainst said face of the holder, and a movable member adapted to bearagainst a por- 'tionof said face K of the tool to clamp the latter inplace, the portion of said face K which is engaged by said member beingsure of'said member tends to turn the rear of the face K hard againstthe face L of- GEORGE AMBORN.

scribing witnesses.

Witnesses:

Omumns B. HARRIS, WILLIAM G. Conn.

'slightly inclined as at V, so that the pres-

